In the mid-90's, TC introduced a design change in their standard barrels, removing the lands from the first inch of the muzzle, making it a "false muzzle", to ensure that a conical is perfectly aligned with the bore before seating it into the rifling with a shot starter, improving conical accuracy...they call it QLA for "Quick Load Accurizer"...It's of zero value using a round ball, and prevents you from being able thumb start a round ball...personally I think it's a waste of a good inch of rifling.